Card counting systems in Blackjack vary in complexity, accuracy, and ease of use. Simpler systems like the Hi-Lo are widely used and easy to learn, assigning values of +1 to low cards (2-6) and -1 to high cards (10s, face cards, and Aces). These systems are effective but can be easily detected by casinos. More advanced systems, such as the Zen Count and Omega II, assign more nuanced values to the cards and provide greater precision, but they are more difficult to master and require greater concentration. These systems are harder to detect but demand higher skill levels. Additionally, systems that adjust for deck penetration, like the True Count, offer increased accuracy in multi-deck games. The complexity of a system often corresponds with the betting strategy, as more advanced systems allow for more detailed adjustments to bet sizes based on the deck composition. Ultimately, the choice of system depends on the player's skill level, experience, and goals, with simpler systems being more accessible but less precise, while advanced systems require more effort but offer higher accuracy.